All Features

Everything you need to improve speed.



Divide work into projects or business areas. Share reports and collaborate on speed.

Pull Request Reviews

Forget testing in production. Know the speed impact of your work without leaving GitHub.

Test Profiles

See how different people experience your sites. Emulate connection speed, devices, test location and more.

Performance Budgets

Create trackable goals. Get notified when you meet or exceed them.

Single Page Tests

Quickly create and share one-off test results with no log-in required.

Insights Email Report

No more data crunching! Receive summaries of speed changes directly to your inbox.

Google Lighthouse built-in

Use the best speed auditing tools. No scripting and maintenance required.

Core Web Vitals support

Track modern metrics that impact your search engine ranking.

Main Thread Execution Timeline

Identify long-running tasks that block JavaScript execution.

Third Party Tracking

Quickly find how external tools and scripts affect your speed. Swap slow for fast.

Pages Leaderboard

Find best or worst performing Pages. Benchmark against your competitors.

Global testing infrastructure

Test across 17 global locations. Discover where your customers’ experience needs most work.

User permissions

Control access with three different roles. Grant management or view-only privileges.

Unlimited data retention

We keep your monitoring data for the lifetime of your account.

CSV Export

Export your data in CSV. Get more visualisation options in tools you know and love.

Advanced test scheduling

Test as often as you need. Daily, hourly or at a selected interval.

Test variability prevention

Always trust your metrics. An AI-powered test verification engine re-tests results when an anomaly is detected.

Unlimited Sites and Pages

Track unlimited URLs at no extra cost, no matter your plan.

Metric charts

See historical performance data for each metric for up to 6 months.

Ad and Third Party Blocking

Block ads and third party resources to establish a performance baseline.

JavaScript timings

Find out the parse, compile and execution cost of internal and vendor scripts.

Test authenticated pages

Authenticate to protected sites with cookies, custom headers or form log-ins.

Site render timeline

Watch your sites load to see speed opportunities and bottlenecks.

Fixed IP addresses

Use fixed IP addresses to ensure requests are securely coming from Calibre.

Request log

Dig into downloaded assets and learn how to optimise their delivery.

HAR files

Download HAR files to understand connectivity and transfer issues.


Command line interface

Automate your performance system with modern, developer-first CLI tooling.

Node.js API

Install our npm package to use Calibre directly in Node.


Add webhooks to retrieve Snapshot data securely through HTTP.

Deploy tracking

Add markers to your charts. Correlate deployments to improvements or regressions.


Email alerts

Get timely notifications about account activity and monitoring data. Never miss an important speed change.

Slack integration

Receive instant alerts about new Snapshots and performance budget status.



Connect to thousands of apps. Create workflows based on speed data and alerts.


Use Pull Request Reviews when deploying Jamstack applications and websites.


Trigger Snapshots after a Netlify deploy and mark releases on your charts.


Send metrics from Calibre to Geckoboard. Visualise performance KPIs in your office.

Security and reliability

Full encryption

We encrypt all of your data at rest in both our databases and file storage.

99.91% uptime

Calibre is available when your business needs it. Always.

GDPR compliance

We comply with EU’s General Data Protection Regulation (GDPR) laws.

Google Single Sign-On

Sign up and log in with your Google account on every Plan tier.

SAML Single Sign-OnCompany Plan

Easily onboard your team using any SAML-compatible identity provider.

Better way to track speed

Nothing to install. Receive your first report in minutes.